Volcano Explorer, Woman, Olive Green Jumpsuit with Straps, White Hard Hat with Visor, Breathing Apparatus, Airtanks

Comes in 4 sets, made of 7 parts. The lowest-priced set it comes in is 60120 Volcano Starter Set (RRP £8.99).

Check the minifigures carefully when buying a used set: they're part of its grade.